Soetrisno, Angga Septa (2016) Pengaruh Waktu Tahan Post-Heat Dan Laju Pendinginan Proses Copperizing Terhadap Struktur Mikro DanKekerasan Copperized-Api 5l Grade B. Undergraduate thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Tembaga merupakan salah satu unsur paduan yang
dapat meningkatkan kekuatan dan kekerasan baja dengan
mekanisme penguatan solid-solution. Dalam penelitian ini,
dilakukan pemaduan tembaga dengan baja API 5L grade B
menggunakan metode copperizing, yaitu mencelupkan baja API
5L grade B yang telah di pre-heat sebelumnya ke dalam tembaga
cair. Selanjutnya dilakukan perlakuan post-heat pada temperatur
1100oC dengan variasi waktu tahan post-heat, yaitu 5, 10 15, dan
20 menit. Setelah diberi perlakuan post-heat, baja kemudian
didinginkan dengan variasi laju pendinginan, yaitu annealing,
normalizing, dan quenching media air. Setelah itu, dilakukan
pengujian struktur mikro, vickers hardness, dan XRD. Pada
penelitian ini, didapatkan hasil bahwa lama waktu tahan postheat
berpengaruh terhadap struktur mikro copperized-API 5L
grade B berdasarkan laju pendinginannya. Pada laju
pendinginan annealing terjadi pertumbuhan butir polygonal
ferrite. Pada laju pendinginan normalizing, terjadi peningkatan
jumlah fase widmanstatten ferrite secara visual pada struktur
mikro baja. Pada laju pendinginan quenching terjadi
peningkatan ukuran jarum-jarum martensite secara visual pada
viii
struktur mikro baja. Laju pendinginan proses copperizing juga
memberikan pengaruh perubahan struktur mikro copperized-API
5L grade B. Pendinginan annealing menghasilkan fase polygonal
ferrite dan pearlite. Pendinginan normalizing menghasilkan fase
grain-boundary ferrite, widmanstatten ferrite, acicular ferrite,
dan pearlite. Pendinginan quenching menghasilkan fase
martensite. Kekerasan copperized-API 5L grade B yang
dihasilkan setelah perlakuan post-heat dengan variasi waktu
tahan pada proses copperizing adalah: pada laju pendinginan
annealing dan quenching, nilai kekerasan turun seiring dengan
bertambahnya waktu tahan post-heat, sedangkan pada laju
pendinginan normalizing kekerasan bertambah seiring dengan
bertambahnya waktu tahan post-heat. Pengaruh laju pendinginan
terhadap kekerasan copperized-API 5L grade B adalah:
kekerasan tertinggi dicapai oleh spesimen dengan laju
pendinginan quenching, sedangkan kekerasan terendah dicapai
oleh spesimen dengan laju pendinginan annealing.
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mechanism. In this research, API 5L grade B is
alloyed with copper using copperizing method, by immersing preheated
API 5L grade B into molten copper. After that, steel is
given a treatment called post-heat at 1100oC with holding time
variation, that is 5, 10, 15, and 20 minutes. After post-heat, steel
is cooled off with variation of cooling rate (annealing,
normalizing, and quenching using water). After that, steel is
tested to observed the microstructure, hardness (using vickers
hardness), and XRD. In this research, the effect of post-heat
holding time to microstructure is based on the cooling rate. In
annealing, the polygonal ferrite grains are growth with
increasing the holding time. In normalizing, widmanstatten ferrite
fraction volume is increased visually in microstructure. In
quenching, the lath martensite become bigger visually in
microstructure. Effect of cooling rates are: in annealing, the
formed phase are polygonal ferrite and pearlite. In normalizing,
the phase are grain boundary ferrite, widmanstatten ferrite,
acicular ferrite, and pearlite. In quenching, the phase is
martensite. The hardness of copperized-API 5L grade B after
post-heat treatment is: in annealing and quenching the hardness
x
is decreased but in normalizing the hardness is increased with
increasing post-heat holding time. The effect of cooling rates
toward hardness of copperized-API 5L grade B are: the highest
hardness is achieved by specimen with quenching cooling rate
and the lowest hardness is achieved by specimen with annealing
cooling rate.
| Item Type: | Thesis (Undergraduate) |
|---|---|
| Additional Information: | RSMt 620.182 Soe p |
| Uncontrolled Keywords: | API 5L grade B, copperizing, post-heat, laju pendinginan. |
| Subjects: | T Technology > TN Mining engineering. Metallurgy T Technology > TN Mining engineering. Metallurgy > TN690 Metallography. Physical metallurgy |
| Divisions: | Faculty of Industrial Technology > Material & Metallurgical Engineering > 28201-(S1) Undergraduate Thesis |
| Depositing User: | EKO BUDI RAHARJO |
| Date Deposited: | 17 Oct 2019 04:00 |
| Last Modified: | 17 Oct 2019 04:00 |
| URI: | http://repository.its.ac.id/id/eprint/71240 |
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